A Caucasian person who acts bad, but normally can't back up his talk. They are often the most hated in jail and prison they are also the most hating. But not all "white boys" are like this only the bad ones are referred to as white boy.

Name for a gang of Irish-Catholic vigilantes in 17th century Ireland. They attacked Protestant landlords who oppressed Catholic tenent farmers. Used today by Irish-Americans to describe a fellow Irishman as a homocidal maniac.

Aye, that's one crazy Whiteboy!
Stay clear of him,that Whiteboy is out for some payback for sure.